More science...
Jun. 10th, 2006 04:52 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
queenofzanHow are magnetism and volcanoes related, if at all?
How does an atmosphere gain pressure, or rather, density, because if the air was more dense, then the pressure would be greater.
And I of course have other questions, with partial answers, but it's hard to find articles relating things sometimes, especially unrelated to Earth. Has it ever occured to encyclopedia writers that sometimes, people are doing research that's not about Earth? Jesus.
Oh, and the reason for all the science stuff and research lately isn't just because I feel like it, it's because of writing, and I'm starting to try to figure something out. You know, real science fiction is a lot of work! Now I know why I never really tried to write science fiction before. Too much work. Yet ideas are funny things, and I can't ignore this one.
So, it's not just because I'm a spaz that I keep posting weird questions like this, hoping for some serendipitious knowledge from one or more of my lj friends. It's in the interest of...er, art? Yeah, let's go with art. Or I guess we could go with science, but not as much. Of course, not that this is really very art-related, but still.
How does an atmosphere gain pressure, or rather, density, because if the air was more dense, then the pressure would be greater.
And I of course have other questions, with partial answers, but it's hard to find articles relating things sometimes, especially unrelated to Earth. Has it ever occured to encyclopedia writers that sometimes, people are doing research that's not about Earth? Jesus.
Oh, and the reason for all the science stuff and research lately isn't just because I feel like it, it's because of writing, and I'm starting to try to figure something out. You know, real science fiction is a lot of work! Now I know why I never really tried to write science fiction before. Too much work. Yet ideas are funny things, and I can't ignore this one.
So, it's not just because I'm a spaz that I keep posting weird questions like this, hoping for some serendipitious knowledge from one or more of my lj friends. It's in the interest of...er, art? Yeah, let's go with art. Or I guess we could go with science, but not as much. Of course, not that this is really very art-related, but still.
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Date: 2006-06-11 12:41 am (UTC)M = "MAGNETISM." When lava cools from its molten state, it often retains an accurate "memory" of the earth's magnetic field at that time. Secular variation, or historical wander of the earth's magnetic poles, has been large enough that careful study of -a lava's magnetic "memory" may reveal its approximate date of cooling. Most dates carry uncertainties in the 25-150-year range. The accuracy of the technique decreases greatly for events older than a few thousand years, and the oldest eruption in this compilation dated by magnetics--Oregon's Mount Bachelor around 5800 BC--carries a ~750-year uncertainty.
From http://www.volcano.si.edu/world/eruptioncriteria.cfm
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Date: 2006-06-11 03:09 am (UTC)no subject
Date: 2006-06-11 12:50 am (UTC)Mars [Acuña et al., 1999] and the Moon [Fuller, 1974] have permanently magnetized patches of rock on their surfaces, suggesting that even if they now lack a dynamo field, at some time in the past they might have possessed one. That would agree with the giant volcanoes (apparently extinct) observed on Mars, which suggest a hot interior, although the volcanoes themselves are not associated with magnetic patches. On Mars, in particular, these patches (as observed by the Mars Global Surveyor) create fields about 20 times stronger than the surface magnetization of Earth (as distinct from the Earth's core magnetic field) would create at the same distance of observation.
From http://www.phy6.org/earthmag/mill_8.htm
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Date: 2006-06-11 03:08 am (UTC)no subject
Date: 2006-06-11 12:53 am (UTC)http://en.wikipedia.org/wiki/Atmospheric_pressure
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Date: 2006-06-11 03:07 am (UTC)no subject
Date: 2006-06-11 01:53 am (UTC)no subject
Date: 2006-06-11 03:30 am (UTC)http://www.space.com/scienceastronomy/astronomy/planet_formation_010810-1.html
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Date: 2006-06-11 08:14 am (UTC)My father who always loves a challenge, after searching on and off for the last day or so went to Ask.com and typed in "How many stars are like our sun?" and got this for an answer...
How many stars are there like our sun within the Milky Way?
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Quite a lot, but hard to estimate. There are perhaps 500 billion stars in the Milky Way, of which something like 0.002 G-type stars with the same luminosity as the sun, per cubic parsec. There are about 0.13 stars/cubic parsec in total, so that sun-like stars are about 1.5 percent of the total population, which makes for about 7 billion stars like our sun in spectral class and brightness by my estimates.
It's not an exact number and it's just in our galaxy, but it gives you a rough idea at least.
http://www.astronomycafe.net/qadir/ask/a11236.html
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Date: 2006-06-19 10:56 pm (UTC)no subject
Date: 2006-06-20 01:25 am (UTC)Are you and Wash still set for coming down to Tucson next weekend? It's $12 per person for Serenity and the Buffy thing.. and we're most likely taking the RV, depending on how many people are going.
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Date: 2006-06-21 01:27 am (UTC)no subject
Date: 2006-06-21 01:50 am (UTC)no subject
Date: 2006-06-21 10:46 pm (UTC)